I was wondering if anyone grows their own white pine in the ground then digs and uses it for developing into bonsai. I 'd love to know what tips / tricks you have for developing this stock. Info such as needle pulling, branch removal, back budding techniques and how to select and use available branches for the final image would be welcome. I have this white pine currently fattening up in my front garden...

JWP is extremely slow growing. Even in the ground. Which is why they're so often grafted onto JBP stock to increase vigor.

Needle pulling generally isn't necessary. Pulling especially. (Later, when they reach the refinement stage, you can cut the old needles very short, and they will dry up and fall off.) Pulling the needles tends to damage the twigs, and will destroy any potential dormant needle bud. Usually in the fall, the old needles turn brown and fall off on their own, or just a gentle touch will cause them to fall off.

Are your JWP grafted? Or growing on their own roots? If grafted, you don't want to push growth too much or else the JBP understock will swell much faster than the JWP, and the graft becomes ugly, or may even fail.